THE ENGING IS STARTING BUT IS NOT WERKING

1996 SEAT Cordoba

Electrical problem
1996 SEAT Cordoba 4 cyl Front Wheel Drive Manual

i have chenge the enging of seat ibiza cordoba tdi turbo ant the car is starting but not werking I have pout my skaner on it ant I found a folt code sais the enging is blokt by imopilaizer system haw can I solve this proplem plise somone help me.